236 results about "Mixed oxide" patented technology

The invention discloses a sulfur-resistant CO-resistant high-entropy intermetallic compound catalyst as well as a preparation method and application thereof. The catalyst is a Ni-Co-Cu-Fe-In-M high-entropy intermetallic compound catalyst obtained by loading a Ni-Co-Cu-Fe-In-M six-membered intermetallic compound on an aluminum-magnesium metal mixed oxide, wherein Ni, Co, Cu and Fe are active metals, In is an inert metal, and M is a sulfur-resistant metal and is selected from one of Zn, Mo and Ce; according to the catalyst, the structural characteristics of LDH are utilized, meanwhile, by means of the synergistic effect of multiple elements in the high-entropy intermetallic compound catalyst, the catalyst has excellent CO resistance, the sulfur resistance of the catalyst is remarkably improved by introducing the auxiliary element M, meanwhile, high conversion rate and high selectivity are taken into consideration, and the catalyst is suitable for industrial production. The technical bottleneck that the existing catalyst is insufficient in CO resistance and sulfur resistance is overcome, and a brand new thought is provided for industrial design of a green methanol synthesis catalyst.

The invention discloses a component gradient iridium tantalum coating anode and a preparation method thereof, the component gradient iridium tantalum coating anode comprises a titanium-based bottom layer, a middle layer and a surface active layer structure with component gradient, and the middle layer and the active layer are both prepared through a thermal decomposition method. And the intermediate layer is prepared on the titanium substrate and is composed of TiO2 / Ta2O5 mixed oxide. The surface active layer is prepared on the outer side of the middle layer and comprises a plurality of layers of IrO2 / Ta2O5 oxide coatings with different iridium-tantalum proportions. Compared with a traditional uniform coating anode, the prepared component gradient iridium tantalum coating anode can relieve the stress concentration phenomenon and reduce coating cracking, the service life of the anode is remarkably prolonged, and the catalytic activity of the anode is remarkably improved; the modified carbon nano tube is added into the active layer precursor solution, so that the conductivity change caused by component gradient is improved, and the cell voltage of the component gradient iridium tantalum coating anode is effectively reduced; and moreover, the iridium content is lower, and the preparation cost of the electrode is reduced.

The invention relates to an antireflection film, an optical conduction assembly, a camera module and electronic equipment. The antireflection film is provided with a light inlet side and a light outlet side and comprises a first mixture film layer, a metal film layer, a second mixture film layer and an inorganic compound film layer which are sequentially stacked in the direction from the light inlet side to the light outlet side. The first mixture film layer and the second mixture film layer are made of aluminum oxide-praseodymium oxide mixed oxide. According to the antireflection film, the materials and the arrangement of the film layers are designed, so that the film layers can be matched with one another, the transmittance of the antireflection film is effectively improved, the reflectivity of the antireflection film is reduced, and the spectral bandwidth of the antireflection film is widened.

The invention relates to the technical field of catalysts, in particular to a dehydrogenation catalyst precursor, a dehydrogenation catalyst and a preparation method and application of the dehydrogenation catalyst precursor. According to the dehydrogenation catalyst precursor, a sulfur-modified magnesium-aluminum mixed oxide is used as a carrier, and a Pt metal cluster is used as an active center; wherein the carrier is a mixed-state metal oxide with a layered hydrotalcite structure, a spinel structure and a near-crystalline synergistic structure. A magnesium-aluminum mixed oxide can be prepared by introducing a precursor of alkali metal magnesium into an aluminum oxide precursor, a layered structure or a spinel structure similar to hydrotalcite can be formed by regulating and controlling the calcination temperature, and by combining carrier surface regulation and control modification, the capability of regulating and controlling the interaction between metal and a carrier can be improved, and the performance of the catalyst is improved. Therefore, the active center of the cluster is maintained, and the acid-base property of the surface of the carrier is effectively modulated, so that carbon deposit is reduced, and the activity and stability of the catalyst are improved.

The present invention relates to a wall-flow filter for removing particles from the exhaust gas of an internal combustion engine, which comprises a coating F, which comprises a sintered material S, wherein material S comprises an oxide, oxide-hydroxide, carbonate, sulphate, silicate, phosphate, mixed oxide, composite oxide, molecular sieve or a mixture comprising two or more of these materials.

The present disclosure relates generally to reverse water-gas shift processes, integrated Fischer-Tropsch processes, and a supported reverse water-gas shift catalyst for conducting these processes. The catalysts described herein include a support that is a cerium oxide support, a titanium oxide support, aluminum oxide support, a zirconium oxide support, or a mixed oxide support comprising a mixture of two or more of cerium oxide, titanium oxide, aluminum oxide, and zirconium oxide; a promoter metal selected from at least one of gallium, indium, lanthanum, titanium, niobium, vanadium, and zirconium, present in an amount in the range of 0.5 to 20 wt%of the catalyst, based on the total weight of the catalyst; and optionally, at least one of platinum, palladium, or gold, present in an amount in the range of 0.05 to 10 wt%of the catalyst, based on the total weight of the catalyst.

The invention relates to a catalyst for wide pressure of methanol from synthesis gas and a preparation method thereof. The catalyst comprises the following components: a catalyst active component, the catalyst active component comprises a mixed oxide of Cu, Zn, Sm and Al or consists of the mixed oxide of Cu, Zn, Sm and Al, and the molar ratio of Cu to Zn to Sm to Al is (10-75): (20-60): (0.5-7): (1-10); the binder is selected from one or more of gamma-Al2O3, silicon dioxide, a silicon-aluminum molecular sieve, activated carbon, a titanium-silicon molecular sieve, hydrotalcite, aluminum silicate, magnesium aluminate spinel, titanium dioxide, bentonite, diatomite, magnesium phosphate, calcium aluminate and calcium silicate. The catalyst provided by the invention can be used for synthesizing methanol from CO and / or CO2 and H2, the reaction can be carried out at low temperature and under wide pressure, and the catalyst shows high activity and good thermal stability.

The invention relates to a technological process for preparing hydrogen by recovering ammonia from acidic wastewater, and belongs to the technical field of wastewater treatment. According to the technological process, ammonia in the wastewater is separated from impurities such as carbon dioxide and hydrogen sulfide through a deamination tower by utilizing the volatility of ammonia, and meanwhile, the recovery rate of the ammonia is increased by adopting a three-stage condensation technology; the ammonia crystallization tower and the ammonia refining unit are used for removing impurities in ammonia, so that the purity of the ammonia is improved; then, ammonia is decomposed into hydrogen and nitrogen under the action of a modified catalyst, the interlayer spacing of nickel-iron layered double hydroxides prepared through a simple coprecipitation method is adjusted through citric acid intercalation, mixed oxides which are highly crossed and evenly distributed are obtained after high-temperature roasting treatment, and on the basis, precious metal ruthenium is introduced to serve as a catalytic activity center; the catalyst has a synergistic effect with nickel, so that the catalytic performance of ammonia decomposition reaction is remarkably improved, efficient and low-cost ammonia decomposition catalyst preparation is realized, and a new solution is provided for wastewater treatment and hydrogen production.

The present invention discloses catalytic devices for the selective catalytic reduction of nitrogen oxides from the exhaust gas of combustion engines, comprising a carrier substrate of length L, a bottom layer comprising a zone D extending from a second side over a length LZ and comprising a first SCR composition consisting of one or more manganese-containing mixed oxides, or a mixture of one or more manganese-containing mixed oxides and one or more metal-promoted small-pore zeolites; and a zone C' extending from a first side over a length LY = L - LZ and comprising a third SCR composition consisting of a V / TiO2 SCR catalyst composition which comprises at least one oxide of vanadium, and a top layer comprising a material zone C extending over the carrier substrate and comprising a second SCR composition consisting of a V / TiO2 SCR catalyst composition which comprises at least one oxide of vanadium.

The invention belongs to the technical field of environmental barrier coatings, and particularly relates to an environmental barrier coating for an outer ring block of an engine and a preparation method of the environmental barrier coating. The environmental barrier coating sequentially comprises a silicon layer, a double-ytterbium silicate layer, a single-ytterbium silicate layer, a transition layer and an abradable layer from inside to outside, and each of the transition layer and the abradable layer comprises a mixed oxide containing aluminum oxide, lanthanum oxide, magnesium oxide and neodymium oxide. The mass ratio of aluminum oxide to lanthanum oxide to magnesium oxide to neodymium oxide in the transition layer is (50-70): (15-25): (10-15): (8-10), and the mass ratio of lanthanum oxide to magnesium oxide to neodymium oxide in the abradable layer is (40-60): (20-30): (15-20): (5-8). The environmental barrier coating has significantly improved abradability, corrosion resistance, life in high temperature service environments.

The invention relates to a design method of a stainless steel-based natural seawater electrolysis high-efficiency catalyst, a catalyst and application thereof, and the design method comprises the following steps: taking a stainless steel mesh as a carrier, and placing the carrier in a high-concentration alkaline solution; the stainless steel surface is subjected to oxidation treatment by applying long-time oxidation voltage to form an amorphous nickel-iron mixed oxide layer, the stainless steel with the oxidation layer formed on the surface is further soaked in a solution containing metal M salt, and nanoclusters loaded with the M salt of the stainless steel oxidation layer are formed through pulse electrodeposition; and the loading capacity and the cluster size of the nanocluster are regulated and controlled by changing the deposition current and the pulse frequency of pulse electrodeposition. Compared with the prior art, excellent seawater electrolysis anode catalysis corrosion resistance is achieved through commercial stainless steel surface modification treatment and precious metal nanocluster loading, and the stainless steel material subjected to modification treatment achieves long-term stable operation under the real seawater electrolysis industrial current density working condition.

The invention discloses a cerium-modified copper-manganese catalyst, a preparation method thereof and application of the cerium-modified copper-manganese catalyst in CO catalytic oxidation. Dissolving a copper salt, a manganese salt and a doping auxiliary agent in water to obtain a copper-manganese mixed solution; adding a precipitant into the copper-manganese mixed solution to carry out precipitation reaction I, and after the reaction is completed, carrying out aging and solid-liquid separation to obtain a composite precipitate I; drying and roasting the composite precipitate I to obtain a copper-manganese mixed oxide; mixing the copper-manganese mixed oxide with a cerium salt solution, adding a precipitant to carry out precipitation reaction II, and after the reaction is completed, carrying out aging and solid-liquid separation to obtain a composite precipitate II; the composite precipitate II is dried and roasted II, and the cerium modified copper-manganese catalyst is obtained and has high low-temperature activity and moisture stability, the conversion rate of catalytic flue gas CO is high, the industrial application value is excellent, the preparation technology is simple, the process is short, and industrial production is facilitated.

The invention relates to a preparation method of electrical-grade magnesium oxide for slowing down current leakage, belongs to the technical field of electrical-grade magnesium oxide, and solves the problems of poor insulativity, relatively high electrical leakage and the like in the actual use process of electrical-grade magnesium oxide. Comprising the following steps: step 1, weighing nano calcium oxide and lanthanide series metal oxide, putting the nano calcium oxide and the lanthanide series metal oxide into a quartz crucible, and uniformly mixing to obtain a primary mixed oxide auxiliary agent; 2, heating the mixed oxide auxiliary agent obtained in the step 1 in a muffle furnace, cooling to room temperature under a drying condition to obtain white powder, and grinding to obtain an oxide auxiliary agent; 3, absorbing ethyl acetate (EA), hydrogen-containing silicone oil and polycyclic aromatic hydrocarbon (D30), putting into a centrifugal tube, and uniformly mixing to obtain a liquid film coating auxiliary agent; the method has the advantages that the current leakage of the electrical-grade magnesium oxide with poor insulativity can be slowed down by adding the metal oxide aid under the condition that the original properties of the electrical-grade magnesium oxide are not changed. The method is simple, convenient and obvious in effect.

Disclosed is a zirconium- and cerium-based mixed oxide composition exhibiting high reducibility, a method for preparing the same, and uses thereof in the field of catalysis.

The invention belongs to the technical field of target materials, and discloses a multi-element doped indium germanium oxide ceramic target material and a preparation method thereof. The ceramic target material comprises indium oxide, germanium oxide and doped oxide, and the doped oxide is one or two of cerium oxide, hafnium oxide or titanium oxide; the preparation method comprises the following steps: mixing In2O3 powder, GeO2 and doped oxide powder, carrying out ball milling, drying, grinding and sieving on the mixed powder to obtain mixed oxide powder, sequentially carrying out compression molding and cold isostatic pressing on the mixed oxide powder to obtain a target material green body, putting the target material green body in an oxygen atmosphere, and carrying out sintering to obtain the target material. A multi-element doped indium germanium oxide ceramic target material is obtained by using a multi-stage sintering method; by adjusting the doping elements in the target material, the proportion of the doping elements and the staged sintering temperature and time, the density and the conductivity of the target material can be remarkably improved.

The invention relates to a paste for establishing a joint connection between parts or joining partners, comprising at least one metal component. According to the invention, metal oxide particles and / or metal mixed oxide particles and / or a mixture of metal oxide particles are used as the metal component, an inert polyether is provided as the solvent, and a reducing agent is contained which reduces the metal oxide particles and / or metal mixed oxide particles and / or the mixture of metal oxide particles during heating and at least partially escapes. The invention further relates to the use of a paste according to the invention for electrically, mechanically and / or thermally connecting at least two parts or joining partners by means of a sintering method. Finally, the concept of the invention also comprises a method containing at least the following steps: - applying the paste to at least one first part, - placing at least one further part such that the applied paste is arranged between the two parts on the surfaces thereof to be connected.

A method and cascade reactor system for producing elemental rare earth metals and rare earth-aluminum alloys via aluminothermic reduction are disclosed. The method involves combining rare earth oxides or halide salts with aluminum powder, initiating a thermite-type reaction under inert or controlled atmospheric conditions, and recovering the molten metal product. Fluxing agents may be used to enhance slag fluidity and phase separation. The cascade reactor comprises multiple thermite zones with staged ignition, thermal transfer mechanisms, and slag separation interfaces, enabling sequential reduction of mixed feedstocks. The system supports both batch and continuous formats and achieves high recovery yields, reduced aluminum contamination, and compatibility with alloying and post-purification processes. The invention is adaptable to individual rare earth species and mixed oxide concentrates, offering a scalable, energy-efficient, and environmentally favorable route to rare earth metal and alloy production.

The present invention belongs to the field of materials production, and more specifically to a method for producing precursors of mixed oxides using a synthetic route that begins with organic acid salts and other organic compounds, based on a step of mixing using a high-shear mixer and a subsequent heat treatment, to thus produce mixed oxides, which can be used, for example, as cathode material for batteries. This synthetic route is simple and fast, has low energy use, is environmentally friendly, and neither the starting materials nor the resulting by-products are harmful to health. Furthermore, at an industrial level, it is easily scalable.

An electrochemical cell has a cathode active material selected from mixed lithium transition metal oxides containing Mn and at least one second transition metal; lithium intercalating mixed oxides containing Ni, Al and at least one second transition metal; and lithium metal phosphates, wherein the outer surface of the particulate cathode active material is at least partially coated with an oxide selected from transition metal oxides, lanthanide oxides, and oxides of metals and half metals of groups 2, 13, and 14 of the periodic system; and an electrolyte composition containing at least one silyl ester phosphonate of formula (I)and at least one silyl ester phosphonate of formula (II)

The present invention relates to a process for producing a transition metal carbonate in a continuous reactor. According to other aspects, the present invention relates to a Li-containing and / or Na-containing transition metal mixed oxide, and to the use of an organic additive for producing a transition metal carbonate as a precursor of an Li-containing and / or Na-containing transition metal mixed oxide.

The invention discloses a preparation method and application of a MXene-based low-temperature denitration catalyst, and relates to the technical field of denitration catalysts. The invention uses a MXene / transition metal composite material obtained by Lewis acid molten salt etching and ammonia water soaking as a catalyst carrier material, potassium permanganate as an oxidant and a manganese source, and an acid as a reaction catalyst. Under the protection of high-purity nitrogen, a low-temperature denitration catalyst of manganese and other metal mixed oxides is prepared by heating and stirring the reaction, and the catalyst is uniformly loaded on the surface of the MXene carrier. The layered structure and chemical activity of the MXene carrier provide sufficient specific surface area and reaction sites for the dispersion and fixation of the mixed oxide catalyst. The MXene-based low-temperature denitration catalyst prepared by the invention has a simple synthesis process, high yield, and is green and environmentally friendly. The catalyst shows high denitration activity in the low-temperature selective catalytic reduction of nitrogen oxides, and thus has good industrial application prospects.

Catalyst for selectively converting CO2 + H2 to CO and H2O, the catalyst comprising a porous support, the support carrying particles, wherein the porous support comprises an oxide of Ce or a mixed oxide of Ce and Zr and wherein the particles comprise at least one ferromagnetic compound, wherein said ferromagnetic compound comprises (i) at least one oxide of Fe, Co, and Ni, or (ii) at least one metal of Fe, Co, and Ni or (iii) at least one oxide of Fe, Co, and Ni and at least one metal of Fe, Co, and Ni.

Preparation of general formula Li 1+x TM 1‑x O 2 A method for preparing an electrode active material, wherein TM is a combination of Mn, Co and Ni in combination with at least one metal M selected from Al, Ti and W, wherein at least 60 mol% of TM is Ni, the percentage being relative to the sum of Ni, Co and Mn, and x is 0-0.2, the method comprising the steps of: (a) mixing the following components: (A) a mixed oxide or oxyhydroxide of Mn, Co and Ni, and (B) at least one lithium compound selected from lithium hydroxide, lithium oxide and lithium carbonate, and (C) an oxide, hydroxide or oxyhydroxide of Al, Ti or W, and (b) heat treating the mixture at a temperature of 700-1000°C.

The present disclosure relates generally to reverse water-gas shift processes, integrated Fischer-Tropsch processes, and supported reverse water-gas shift catalysts for conducting these processes. The catalysts described herein include a support that is a cerium oxide support, a titanium oxide support, an aluminum oxide support, a zirconium oxide support, or a mixed oxide support comprising a mixture of two or more of cerium oxide, titanium oxide, aluminum oxide, and zirconium oxide; and manganese, present in an amount in the range of 0.5 to 20 wt % of the catalyst, based on the total weight of the catalyst.

The compositions disclosed herein are compositions having a mixed oxide core consisting of alumina-free cerium oxide and zirconium oxide. The mixed oxide core contains, based on its total weight, about 15% to about 60% by weight of cerium oxide and about 40% to about 85% by weight of zirconium oxide. The mixed oxide core has a rare earth oxide coating on its surface, the rare earth oxide being selected from the group consisting of cerium, lanthanum, neodymium, praseodymium, yttrium and mixtures thereof. Furthermore, noble metals such as palladium or rhodium are dispersed on the surface of these compositions, and the dispersion of rhodium or palladium is higher compared to compositions containing a mixed oxide core without a rare earth oxide coating. Furthermore, methods for producing these compositions are also disclosed herein. These compositions can be used as part of a catalyst system.

The invention is applicable to the technical field of glass fibers, and provides a low-dielectric glass fiber, which is characterized by comprising 50.0 to 58.0 wt% of SiO2, 18.0 to 26.0 wt% of B2O3, 13.0 to 18.0 wt% of Al2O3, 0.0 to 5.0 wt% of Mg0, 2.0 to 5.0 wt% of Ca0, 0.0 to 0.5 wt% of R20, 0.0 to 1.5 wt% of TiO2 and 0.0 to 3.0 wt% of a titanium-zirconium-hafnium ternary mixed oxide. The method can effectively solve the problems that in the prior art, bubble detection lags behind, a temperature control system operates in an isolated mode, and technological parameter optimization depends on experience, instant feedback of bubble data is achieved through the real-time online bubble detection technology, and powerful support is provided for accurate adjustment of clarification technological parameters.

The present invention describes the preparation of heterogeneous catalysts of mixed oxides based upon niobium and mixed oxides of zinc, manganese, nickel, cobalt and / or aluminum, originating from hydrotalcites (HTs) as precursor phase of heterogeneous catalysts, and application thereof in the chemical recycling of poly(ethylene terephthalate) (PET) for the production of metal free bis(hydroxy)ethylene (BHET) monomers and oligomers having a processing performance similar to that of the homogeneous catalysis system.

The application is a preparation method of a chemical vapor deposition dysprosium hafnium oxide ceramic coating, which uses Dy and Hf metal particles and related process gas as raw materials, uses chemical vapor deposition technology, and controls the heating temperature of a vacuum chamber of a chemical vapor deposition device, vacuum degree, process gas type and flow, deposition time and other factors to first co-deposit and prepare Dy2O3 and HfO2 mixed oxides on the surface of a nickel-based high-temperature alloy, and then in-situ synthesize a Dy2Hf2O7 ceramic coating with a fluorite structure at high temperature. The ceramic coating has the advantages of stable high-temperature phase structure, low thermal conductivity, sintering resistance, molten salt corrosion resistance and excellent strain tolerance, is suitable for use in high-temperature flame service working conditions above 1300 DEG C, and can improve the heat insulation effect of the thermal barrier coating of the turbine blade of an aero-engine.

A HUD system including a light source projecting p-polarized light towards a glazing, the glazing includes an outer sheet of glass having a first surface and a second surface, and an inner sheet of glass having a first surface and a second surface, and the second surface of the inner sheet of glass has a first coating, where both sheets are bonded by at least one sheet of interlayer material, and the first coating includes at least one high refractive index layer having a thickness from 50 to 100 nm, and at least one low refractive index layer having a thickness from 70 to 160 nm, and the least one high refractive index layer has at least one of an oxide of Zr, Nb, Sn; a mixed oxide of Ti, Zr, Nb, Si, Sb, Sn, Zn, In; a nitride of Si, Zr; or a mixed nitride of Si, Zr.

Disclosed is a composition comprising at least a cerium and zirconium based mixed oxide comprising zirconium, cerium, lanthanum and optionally at least one rare earth other than cerium and lanthanum; said mixed oxide exhibiting a high thermal resistance and are in particular capable of maintaining a large specific surface area even in a high temperature environment. Also disclosed is a process for the synthesis of such compositions.